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AMD is busy with Mantle, and Steamboxes are not here yet. (So if AMD have to prioritize...)
EDIT:
Radeon drivers are not yet ready for prime time for such perf. oriented audience as Steambox users. But hey, maybe it will change with radeonsi gen hw.

I'm tired of catalyst and don't really want to try it out.
My system runs much smoother with RadeonSI. Everything that works just works without issues, crashes, glitches.
Metro runs very well on Kaveri (mesa 10.2 git)

I'm tired of catalyst and don't really want to try it out.
My system runs much smoother with RadeonSI. Everything that works just works without issues, crashes, glitches.
Metro runs very well on Kaveri (mesa 10.2 git)

Agreed. I fired up Portal 2 last night on my 7850 using the radeonsi driver and played for ~2 hours. At no point was the framerate anything but smooth. I don't have actual numbers, but the point is that it performed well enough that I didn't care. This is a huge improvement from when I first ran TF2 on my 6850 about a year ago. There was lots of stuttering and pausing all over the place. Of course the 6850 has also smoothed out over time, which just makes me want to thank the 3D driver devs even more.

In all fairness, the Catalyst problems are not only with LINUX...example:

Enemy Territory: QUAKE Wars

In Windows XP i get with certain settings 150-200 FPS....and overall feeling is very smooth.

In W7/W8/W8.1 i get with same settings....30-50 FPS...and stutters like crazy when straffing.

All this with same hardware and same game settings....

This means that even in Window$-land, i have to use WinXP to have some decent gaming experience with OGL games...or at least with some titles.

Tonight i gonna give a shot with OSS Radeon to see if i can have finally some quality gaming with AMD hardware in LINUX.

BTW, nowadays its a piece of cake to install Steam client in SLACKWARE so i guess i will dump Linux Mint or any UBUNTU derivated for good....this is because between UBUNTU-derivated and SLACKWARE, performance of SLACKWARE is ALWAYS superior.

Only needed to use deb2tgz to convert steam_latest.deb to a .tgz file and use installpkg as usual to install Steam client